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Field Survey Summary Tables – Lethbridge County
107
Table 116. 2009 irrigated annual crops in Lethbridge County (127 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
47.4
16.3
34.4
4.5
9.5
73.4
50.8
2
Wild buckwheat
56.8
15.0
26.4
1.9
3.3
28.0
38.6
3
Wild oats
35.2
10.5
29.8
1.9
5.3
47.0
28.6
4
Kochia
37.3
7.6
20.5
1.3
3.5
89.6
23.5
5
Lamb's-quarters
32.2
7.6
23.6
1.0
3.1
34.8
20.5
6
Chickweed
8.3
2.3
27.4
2.9
34.9
206.0
19.1
7
Canola (Argentine)
22.0
7.9
35.9
1.1
5.2
36.4
19.1
8
Round-leaved mallow
32.4
7.0
21.5
0.7
2.3
28.6
18.7
9
Dandelion
28.2
5.7
20.2
0.5
1.9
13.4
15.3
10
Annual sow-thistle
16.0
4.6
28.8
0.6
3.7
27.2
11.6
11
Canada thistle
14.8
3.3
22.5
0.4
2.4
13.2
8.8
12
Alfalfa
8.7
1.9
22.2
0.7
8.4
106.2
7.8
13
Quack grass
7.2
2.5
34.4
0.6
8.8
28.4
7.5
14
Shepherd's-purse
6.5
1.7
26.6
0.2
3.4
15.8
4.4
15
Perennial sow-thistle
6.1
1.2
18.9
0.2
2.8
19.6
3.5
16
Prostrate knotweed
5.1
1.0
20.0
0.1
2.0
7.6
2.8
17
Cleavers
4.2
1.2
29.4
0.1
1.6
3.6
2.6
18
Spiny annual sow-thistle
0.6
0.6 100.0
0.4
57.6
57.6
2.6
19
Wheat
2.2
0.9
42.9
0.2
7.0
13.4
2.3
20
Stork's-bill
5.7
0.6
11.2
< 0.1
0.5
1.6
2.2
21
Pale smartweed
4.7
0.6
12.0
< 0.1
0.8
2.0
1.9
22
Prickly lettuce
2.6
0.7
26.4
0.1
2.3
5.4
1.6
23
Field bindweed
2.6
0.5
18.6
< 0.1
1.0
1.6
1.2
24
Green foxtail
2.2
0.2
10.0
< 0.1
0.8
1.0
0.9
25
Stinkweed
2.6
0.1
5.0
< 0.1
0.3
0.6
0.8
26
Russian thistle
1.0
0.3
30.0
< 0.1
3.4
3.4
0.7
27
Corn spurry
1.9
0.1
7.5
< 0.1
0.3
0.4
0.7
28
Wild tomato
1.6
0.2
11.1
< 0.1
0.9
1.4
0.6
29
Barnyard grass
0.6
0.2
25.0
< 0.1
6.2
6.2
0.5
30
Flixweed
1.0
< 0.1
5.0
< 0.1
0.2
0.2
0.3
31
Corn
0.6
0.1
10.0
< 0.1
0.4
0.4
0.2
32
Millet
0.6
< 0.1
5.0
< 0.1
0.2
0.2
0.2